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### MP-090 APC UART input error

An RS232 data transmission error (such as character overrun) has occurred on the APC to SMP400 communication line.

What you should do:

1. To clear the error, click Clear error in the XYZ Display window.

To clear it using an RCU-II, press and hold down the Servo Power Off button and then press the Joy button twice.

2. If the error reoccurs, contact your Giddings & Lewis service representative.